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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 188,699 | $ 156,548
Short-term investments | 51,598 | 26,109
Total cash, cash equivalents and short-term investments | 240,297 | 182,657
Settlement assets | 149,785 | 169,327
Trade accounts receivable: |  |
Billed, net of allowance of $3,628 and $3,735 | 226,623 | 244,058
Unbilled | 37,785 | 33,450
Income taxes receivable | 2,167 | 4,297
Other current assets | 41,688 | 35,293
Total current assets | 698,345 | 669,082
Non-current assets: |  |
Property and equipment, net of depreciation of $105,073 and $98,029 | 81,759 | 84,429
Operating lease right-of-use assets | 110,756 | 94,847
Intangible assets | 26,453 | 32,526
Goodwill | 272,322 | 259,164
Customer contract costs, net of amortization of $39,893 and $31,526 | 47,238 | 50,746
Deferred income taxes | 10,205 | 9,392
Other assets | 36,910 | 27,739
Total non-current assets | 633,655 | 613,948
Total assets | 1,332,000 | 1,283,030
Current liabilities: |  |
Current portion of long-term debt | 14,063 | 10,313
Operating lease liabilities | 22,651 | 22,442
Customer deposits | 39,992 | 38,687
Trade accounts payable | 29,834 | 32,704
Accrued employee compensation | 86,289 | 77,527
Settlement liabilities | 148,819 | 168,342
Deferred revenue | 52,357 | 45,094
Income taxes payable | 6,627 | 2,806
Other current liabilities | 19,383 | 20,778
Total current liabilities | 420,015 | 418,693
Non-current liabilities: |  |
Long-term debt, net of unamortized discounts of $5,346 and $10,053 | 337,154 | 346,509
Operating lease liabilities | 95,926 | 78,936
Deferred revenue | 17,275 | 18,552
Income taxes payable | 2,436 | 2,543
Deferred income taxes | 5,109 | 6,376
Other non-current liabilities | 31,690 | 14,759
Total non-current liabilities | 489,590 | 467,675
Total liabilities | 909,605 | 886,368
Stockholders' equity: |  |
Preferred stock, par value $.01 per share; 10,000 shares authorized; zero shares issued and outstanding |  |
Common stock, par value $.01 per share; 100,000 shares authorized; 5,929 and 3,661 shares reserved for employee stock purchase plan and stock incentive plans; 32,713 and 32,891 shares outstanding | 700 | 696
Additional paid-in capital | 470,557 | 454,663
Treasury stock, at cost; 35,980 and 35,356 shares | (894,126) | (867,817)
Accumulated other comprehensive income (loss): |  |
Unrealized gains on short-term investments, net of tax | 13 | 16
Cumulative foreign currency translation adjustments | (31,151) | (39,519)
Accumulated earnings | 876,402 | 848,623
Total stockholders' equity | 422,395 | 396,662
Total liabilities and stockholders' equity | 1,332,000 | 1,283,030
Software |  |
Non-current assets: |  |
Intangible assets | 26,453 | 32,526
Acquired customer contracts |  |
Non-current assets: |  |
Intangible assets | $ 48,012 | $ 55,105

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